[JRTJH]

You might want to consider installing shock absorbers, but the very first thing I'd do is get some accurate weights on your rig. The vehicle front axle, rear axle and trailer axle weights with the distribution bars installed, then uncouple the distribution bars and reweigh. Pull off the scale, unhitch and then return to the scale to weigh the vehicle without the trailer. Then you'll have all the numbers you need to see exactly what weights you're putting on your vehicle and how much you're transferring back to the trailer.

Uncomfortable "chucking" that occurs on some highways is made worse by the "spring action" of the distribution bars as they react to the rise/fall of the tow vehicle as it's related to the trailer axles. Weighing your rig, will give you the information on just how your rig is "loaded", if you're not overloading your tow vehicle and/or the hitch bars, then, since an improved equalizer system isn't available, you might want to consider shocks. Shocks will help (not completely reduce) the "feedback forces" as the trailer responds to the spring action of the hitch distribution bars.